Melinda Brady, wife of David Laffer, who is accused of killing four people in a pharmacy robbery, stands with her attorney, Jeremy Mis, Friday, June 24, 2011, in Central Islip, N.Y. (AP Photo/Kathy Kmonicek, Pool)

MEDFORD, NY (CBSNewYork) — The wife of the suspect accused in the Medford pharmacy massacre pleaded not guilty to related charges.

Melinda Brady was arraigned Friday morning at a Central Islip courtroom on third-degree robbery and obstruction charges. A judge set bail at $750,000 cash or a $1.5 million bond.

Assistant District Attorney James Chalifoux said a grand jury will consider more serious charges against Brady when it convenes on Monday.

“It’s based upon her admitted role in what I submit as the most horrific and chilling robbery-murder in Suffolk County history,” said Chalifoux.

Chalifoux said additional charges will depend on what Brady knew and when.

More information is also coming to light indicating that Brady may have been far more involved in the drugstore massacre than previously thought. Brady is being accused of premeditating the robbery, CBS 2’s Jennifer McLogan reported.

According to court papers, Brady told authorities that she and Laffer discussed robbing the pharmacy the night before and that he was only to threaten to steal the drugs.

“Part of her admissions include driving with the defendant to that location and driving away from that location,” Chalifoux said.

Officials said Brady told police her husband went to the pharmacy to steal drugs for her. According to the criminal complaint filed with the court case, Brady also gave Laffer a prescription written for her to use during the robbery.

Brady told detectives her husband was only supposed to threaten the pharmicist and steal the thousands of hydrocodone pills. The complaint also said that Brady knowingly went with Laffer to rob the pharmacy and admitted driving the getaway car — a 1998 Nissan Pathfinder.

Brady was taken to St. Catherine’s Hospital in Smithtown on Thursday but was discharged early Friday morning for her arraignment.